P4Helpers Namespace Reference

Functions
double	deltaEta (const I4Momentum &p1, const I4Momentum &p2)
	Computes efficiently {}.
double	deltaEtaSq (const I4Momentum &p1, const I4Momentum &p2)
	Computes efficiently {}^2.
double	deltaEta (const I4Momentum *const p1, const I4Momentum *const p2)
	Computes efficiently {}, pointer args.
double	deltaPhi (double phiA, double phiB)
double	deltaPhi (const I4Momentum &p4, const double phi)
double	deltaPhi (const I4Momentum &pA, const I4Momentum &pB)
double	deltaPhiSq (const I4Momentum &pA, const I4Momentum &pB)
double	deltaPhi (const I4Momentum *const pA, const I4Momentum *const pB)
double	deltaR (const I4Momentum &p4, double eta, double phi)
	{R} from 1 I4Momentum
double	deltaR (const I4Momentum &pA, const I4Momentum &pB)
double	deltaR (const I4Momentum *const pA, const I4Momentum *const pB)
bool	isInDeltaR (const I4Momentum &p1, const I4Momentum &p2, double dR)
double	invMass (const I4Momentum &pA, const I4Momentum &pB)
double	invMass (const I4Momentum *const pA, const I4Momentum *const pB)
double	invMass (const I4Momentum &pA, const I4Momentum &pB, const I4Momentum &pC, const I4Momentum &pD)
double	invMass (const I4Momentum *const pA, const I4Momentum *const pB, const I4Momentum *const pC, const I4Momentum *const pD)
template<class Iterator_t , class Predicate_t >
void	sort (Iterator_t itr, Iterator_t itrEnd, Predicate_t p)
	sort a container according to the given predicate
template<class Container_t , class Predicate_t >
void	sort (Container_t &container, Predicate_t p)
	sort a container according to the given predicate
template<class Container_t >
bool	closestDeltaR (const double eta, const double phi, Container_t &coll, std::size_t &index, double &deltaR)
template<class Container_t >
bool	closestDeltaR (const I4Momentum &p4, Container_t &coll, std::size_t &index, double &deltaR)
template<class Container_t >
bool	closestDeltaR (const double eta, const double phi, const double ene, Container_t &coll, std::size_t &index, double &deltaR, double &deltaE)
template<class Container_t >
bool	closestDeltaR (const I4Momentum &p4, Container_t &coll, std::size_t &index, double &deltaR, double &deltaE)

---

Detailed Description

P4Helpers provides static helper functions for kinematic calculation on objects deriving from I4Momentum.

Author:

David Rousseau rousseau@lal.in2p3.fr

Sebastien Binet binet@cern.ch

Tadashi Maeno

---

Function Documentation

template<class Container_t >

bool P4Helpers::closestDeltaR	(	const I4Momentum &	p4,
		Container_t &	coll,
		std::size_t &	index,
		double &	deltaR,
		double &	deltaE
	)			[inline]

find the closest element in R - with a condition on E

Parameters:

	index	[out] index of the closest element
	deltaR	[out] {R}
	deltaE	[out] {E}

Returns:

false if found

template<class Container_t >

bool P4Helpers::closestDeltaR	(	const double	eta,
		const double	phi,
		const double	ene,
		Container_t &	coll,
		std::size_t &	index,
		double &	deltaR,
		double &	deltaE
	)			[inline]

find the closest element in R - with a condition on E

Parameters:

	index	[out] index of the closest element
	deltaR	[out] {R}
	deltaE	[out] {E}

Returns:

true if found

template<class Container_t >

bool P4Helpers::closestDeltaR	(	const I4Momentum &	p4,
		Container_t &	coll,
		std::size_t &	index,
		double &	deltaR
	)			[inline]

Find the closest element in a collection to an I4Momentum

Parameters:

	index	[out] index of the closest element
	deltaR	[out] {R}

Returns:

true if found

template<class Container_t >

bool P4Helpers::closestDeltaR	(	const double	eta,
		const double	phi,
		Container_t &	coll,
		std::size_t &	index,
		double &	deltaR
	)			[inline]

Find the closest element in a collection to an I4Momentum

Parameters:

	index	[out] index of the closest element
	deltaR	[out] {R}

Returns:

true if found

double P4Helpers::deltaPhi	(	const I4Momentum *const	pA,
		const I4Momentum *const	pB
	)			[inline]

delta Phi in range [-pi,pi[ from two I4momentum pointers

double P4Helpers::deltaPhi	(	const I4Momentum &	pA,
		const I4Momentum &	pB
	)			[inline]

delta Phi in range [-pi,pi[ from two I4momentum references

double P4Helpers::deltaPhi	(	const I4Momentum &	p4,
		const double	phi
	)			[inline]

delta Phi in range [-pi,pi[ from one I4momentum reference

double P4Helpers::deltaPhi	(	double	phiA,
		double	phiB
	)			[inline]

delta Phi in range [-pi,pi[

double P4Helpers::deltaPhiSq	(	const I4Momentum &	pA,
		const I4Momentum &	pB
	)			[inline]

delta Phi squared in range ([-pi,pi[)^2 from two I4momentum references

double P4Helpers::deltaR	(	const I4Momentum *const	pA,
		const I4Momentum *const	pB
	)			[inline]

delta R from two I4momentum pointers

double P4Helpers::deltaR	(	const I4Momentum &	pA,
		const I4Momentum &	pB
	)			[inline]

delta R from two I4momentum reference

double P4Helpers::invMass	(	const I4Momentum *const	pA,
		const I4Momentum *const	pB,
		const I4Momentum *const	pC,
		const I4Momentum *const	pD
	)			[inline]

invariant mass from four I4momentum pointers

double P4Helpers::invMass	(	const I4Momentum &	pA,
		const I4Momentum &	pB,
		const I4Momentum &	pC,
		const I4Momentum &	pD
	)			[inline]

invariant mass from four I4momentum references

double P4Helpers::invMass	(	const I4Momentum *const	pA,
		const I4Momentum *const	pB
	)			[inline]

invariant mass from two I4momentum pointers

double P4Helpers::invMass	(	const I4Momentum &	pA,
		const I4Momentum &	pB
	)			[inline]

invariant mass from two I4momentum references

bool P4Helpers::isInDeltaR	(	const I4Momentum &	p1,
		const I4Momentum &	p2,
		double	dR
	)			[inline]

Check if 2 I4Momentum are in a {R} cone

Parameters:

dR

[in] {R}

Returns:

true if they are